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linux_dsm_epyc7002/arch/x86/kernel/quirks.c
Peter Neubauer 2e151c70df x86: HPET force enable for e6xx based systems 
As the Soekris net6501 and other e6xx based systems do not have
any ACPI implementation, HPET won't get enabled.
This patch enables HPET on such platforms.

[    0.430149] pci 0000:00:01.0: Force enabled HPET at 0xfed00000
[    0.644838] HPET: 3 timers in total, 0 timers will be used for per-cpu timer

Original patch by Peter Neubauer (http://www.mail-archive.com/soekris-tech@lists.soekris.com/msg06462.html)
slightly modified by Conrad Kostecki <ck@conrad-kostecki.de> and massaged
accoring to Thomas Gleixners <tglx@linutronix.de> by me.

Suggested-by: Conrad Kostecki <ck@conrad-kostecki.de>
Signed-off-by: Eric Sesterhenn <eric.sesterhenn@lsexperts.de>
Cc: Peter Neubauer <pneubauer@bluerwhite.org>
Link: http://lkml.kernel.org/r/5412D3A5.2030909@lsexperts.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-09-15 17:53:35 -07:00

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/*
* This file contains work-arounds for x86 and x86_64 platform bugs.
*/
#include <linux/pci.h>
#include <linux/irq.h>
#include <asm/hpet.h>
#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
static void quirk_intel_irqbalance(struct pci_dev *dev)
{
u8 config;
u16 word;
/* BIOS may enable hardware IRQ balancing for
* E7520/E7320/E7525(revision ID 0x9 and below)
* based platforms.
* Disable SW irqbalance/affinity on those platforms.
*/
if (dev->revision > 0x9)
return;
/* enable access to config space*/
pci_read_config_byte(dev, 0xf4, &config);
pci_write_config_byte(dev, 0xf4, config|0x2);
/*
* read xTPR register. We may not have a pci_dev for device 8
* because it might be hidden until the above write.
*/
pci_bus_read_config_word(dev->bus, PCI_DEVFN(8, 0), 0x4c, &word);
if (!(word & (1 << 13))) {
dev_info(&dev->dev, "Intel E7520/7320/7525 detected; "
"disabling irq balancing and affinity\n");
noirqdebug_setup("");
#ifdef CONFIG_PROC_FS
no_irq_affinity = 1;
#endif
}
/* put back the original value for config space*/
if (!(config & 0x2))
pci_write_config_byte(dev, 0xf4, config);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7320_MCH,
quirk_intel_irqbalance);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7525_MCH,
quirk_intel_irqbalance);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E7520_MCH,
quirk_intel_irqbalance);
#endif
#if defined(CONFIG_HPET_TIMER)
unsigned long force_hpet_address;
static enum {
NONE_FORCE_HPET_RESUME,
OLD_ICH_FORCE_HPET_RESUME,
ICH_FORCE_HPET_RESUME,
VT8237_FORCE_HPET_RESUME,
NVIDIA_FORCE_HPET_RESUME,
ATI_FORCE_HPET_RESUME,
} force_hpet_resume_type;
static void __iomem *rcba_base;
static void ich_force_hpet_resume(void)
{
u32 val;
if (!force_hpet_address)
return;
BUG_ON(rcba_base == NULL);
/* read the Function Disable register, dword mode only */
val = readl(rcba_base + 0x3404);
if (!(val & 0x80)) {
/* HPET disabled in HPTC. Trying to enable */
writel(val | 0x80, rcba_base + 0x3404);
}
val = readl(rcba_base + 0x3404);
if (!(val & 0x80))
BUG();
else
printk(KERN_DEBUG "Force enabled HPET at resume\n");
return;
}
static void ich_force_enable_hpet(struct pci_dev *dev)
{
u32 val;
u32 uninitialized_var(rcba);
int err = 0;
if (hpet_address || force_hpet_address)
return;
pci_read_config_dword(dev, 0xF0, &rcba);
rcba &= 0xFFFFC000;
if (rcba == 0) {
dev_printk(KERN_DEBUG, &dev->dev, "RCBA disabled; "
"cannot force enable HPET\n");
return;
}
/* use bits 31:14, 16 kB aligned */
rcba_base = ioremap_nocache(rcba, 0x4000);
if (rcba_base == NULL) {
dev_printk(KERN_DEBUG, &dev->dev, "ioremap failed; "
"cannot force enable HPET\n");
return;
}
/* read the Function Disable register, dword mode only */
val = readl(rcba_base + 0x3404);
if (val & 0x80) {
/* HPET is enabled in HPTC. Just not reported by BIOS */
val = val & 0x3;
force_hpet_address = 0xFED00000 | (val << 12);
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
iounmap(rcba_base);
return;
}
/* HPET disabled in HPTC. Trying to enable */
writel(val | 0x80, rcba_base + 0x3404);
val = readl(rcba_base + 0x3404);
if (!(val & 0x80)) {
err = 1;
} else {
val = val & 0x3;
force_hpet_address = 0xFED00000 | (val << 12);
}
if (err) {
force_hpet_address = 0;
iounmap(rcba_base);
dev_printk(KERN_DEBUG, &dev->dev,
"Failed to force enable HPET\n");
} else {
force_hpet_resume_type = ICH_FORCE_HPET_RESUME;
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
}
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB2_0,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_31,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_1,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH8_4,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH9_7,
ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x3a16, /* ICH10 */
ich_force_enable_hpet);
static struct pci_dev *cached_dev;
static void hpet_print_force_info(void)
{
printk(KERN_INFO "HPET not enabled in BIOS. "
"You might try hpet=force boot option\n");
}
static void old_ich_force_hpet_resume(void)
{
u32 val;
u32 uninitialized_var(gen_cntl);
if (!force_hpet_address || !cached_dev)
return;
pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
gen_cntl &= (~(0x7 << 15));
gen_cntl |= (0x4 << 15);
pci_write_config_dword(cached_dev, 0xD0, gen_cntl);
pci_read_config_dword(cached_dev, 0xD0, &gen_cntl);
val = gen_cntl >> 15;
val &= 0x7;
if (val == 0x4)
printk(KERN_DEBUG "Force enabled HPET at resume\n");
else
BUG();
}
static void old_ich_force_enable_hpet(struct pci_dev *dev)
{
u32 val;
u32 uninitialized_var(gen_cntl);
if (hpet_address || force_hpet_address)
return;
pci_read_config_dword(dev, 0xD0, &gen_cntl);
/*
* Bit 17 is HPET enable bit.
* Bit 16:15 control the HPET base address.
*/
val = gen_cntl >> 15;
val &= 0x7;
if (val & 0x4) {
val &= 0x3;
force_hpet_address = 0xFED00000 | (val << 12);
dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
force_hpet_address);
return;
}
/*
* HPET is disabled. Trying enabling at FED00000 and check
* whether it sticks
*/
gen_cntl &= (~(0x7 << 15));
gen_cntl |= (0x4 << 15);
pci_write_config_dword(dev, 0xD0, gen_cntl);
pci_read_config_dword(dev, 0xD0, &gen_cntl);
val = gen_cntl >> 15;
val &= 0x7;
if (val & 0x4) {
/* HPET is enabled in HPTC. Just not reported by BIOS */
val &= 0x3;
force_hpet_address = 0xFED00000 | (val << 12);
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
cached_dev = dev;
force_hpet_resume_type = OLD_ICH_FORCE_HPET_RESUME;
return;
}
dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
}
/*
* Undocumented chipset features. Make sure that the user enforced
* this.
*/
static void old_ich_force_enable_hpet_user(struct pci_dev *dev)
{
if (hpet_force_user)
old_ich_force_enable_hpet(dev);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12,
old_ich_force_enable_hpet_user);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0,
old_ich_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_12,
old_ich_force_enable_hpet);
static void vt8237_force_hpet_resume(void)
{
u32 val;
if (!force_hpet_address || !cached_dev)
return;
val = 0xfed00000 | 0x80;
pci_write_config_dword(cached_dev, 0x68, val);
pci_read_config_dword(cached_dev, 0x68, &val);
if (val & 0x80)
printk(KERN_DEBUG "Force enabled HPET at resume\n");
else
BUG();
}
static void vt8237_force_enable_hpet(struct pci_dev *dev)
{
u32 uninitialized_var(val);
if (hpet_address || force_hpet_address)
return;
if (!hpet_force_user) {
hpet_print_force_info();
return;
}
pci_read_config_dword(dev, 0x68, &val);
/*
* Bit 7 is HPET enable bit.
* Bit 31:10 is HPET base address (contrary to what datasheet claims)
*/
if (val & 0x80) {
force_hpet_address = (val & ~0x3ff);
dev_printk(KERN_DEBUG, &dev->dev, "HPET at 0x%lx\n",
force_hpet_address);
return;
}
/*
* HPET is disabled. Trying enabling at FED00000 and check
* whether it sticks
*/
val = 0xfed00000 | 0x80;
pci_write_config_dword(dev, 0x68, val);
pci_read_config_dword(dev, 0x68, &val);
if (val & 0x80) {
force_hpet_address = (val & ~0x3ff);
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
cached_dev = dev;
force_hpet_resume_type = VT8237_FORCE_HPET_RESUME;
return;
}
dev_printk(KERN_DEBUG, &dev->dev, "Failed to force enable HPET\n");
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235,
vt8237_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237,
vt8237_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CX700,
vt8237_force_enable_hpet);
static void ati_force_hpet_resume(void)
{
pci_write_config_dword(cached_dev, 0x14, 0xfed00000);
printk(KERN_DEBUG "Force enabled HPET at resume\n");
}
static u32 ati_ixp4x0_rev(struct pci_dev *dev)
{
int err = 0;
u32 d = 0;
u8 b = 0;
err = pci_read_config_byte(dev, 0xac, &b);
b &= ~(1<<5);
err |= pci_write_config_byte(dev, 0xac, b);
err |= pci_read_config_dword(dev, 0x70, &d);
d |= 1<<8;
err |= pci_write_config_dword(dev, 0x70, d);
err |= pci_read_config_dword(dev, 0x8, &d);
d &= 0xff;
dev_printk(KERN_DEBUG, &dev->dev, "SB4X0 revision 0x%x\n", d);
WARN_ON_ONCE(err);
return d;
}
static void ati_force_enable_hpet(struct pci_dev *dev)
{
u32 d, val;
u8 b;
if (hpet_address || force_hpet_address)
return;
if (!hpet_force_user) {
hpet_print_force_info();
return;
}
d = ati_ixp4x0_rev(dev);
if (d < 0x82)
return;
/* base address */
pci_write_config_dword(dev, 0x14, 0xfed00000);
pci_read_config_dword(dev, 0x14, &val);
/* enable interrupt */
outb(0x72, 0xcd6); b = inb(0xcd7);
b |= 0x1;
outb(0x72, 0xcd6); outb(b, 0xcd7);
outb(0x72, 0xcd6); b = inb(0xcd7);
if (!(b & 0x1))
return;
pci_read_config_dword(dev, 0x64, &d);
d |= (1<<10);
pci_write_config_dword(dev, 0x64, d);
pci_read_config_dword(dev, 0x64, &d);
if (!(d & (1<<10)))
return;
force_hpet_address = val;
force_hpet_resume_type = ATI_FORCE_HPET_RESUME;
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
force_hpet_address);
cached_dev = dev;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS,
ati_force_enable_hpet);
/*
* Undocumented chipset feature taken from LinuxBIOS.
*/
static void nvidia_force_hpet_resume(void)
{
pci_write_config_dword(cached_dev, 0x44, 0xfed00001);
printk(KERN_DEBUG "Force enabled HPET at resume\n");
}
static void nvidia_force_enable_hpet(struct pci_dev *dev)
{
u32 uninitialized_var(val);
if (hpet_address || force_hpet_address)
return;
if (!hpet_force_user) {
hpet_print_force_info();
return;
}
pci_write_config_dword(dev, 0x44, 0xfed00001);
pci_read_config_dword(dev, 0x44, &val);
force_hpet_address = val & 0xfffffffe;
force_hpet_resume_type = NVIDIA_FORCE_HPET_RESUME;
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at 0x%lx\n",
force_hpet_address);
cached_dev = dev;
return;
}
/* ISA Bridges */
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0050,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0051,
nvidia_force_enable_hpet);
/* LPC bridges */
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0260,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0360,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0361,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0362,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0363,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0364,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0365,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0366,
nvidia_force_enable_hpet);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, 0x0367,
nvidia_force_enable_hpet);
void force_hpet_resume(void)
{
switch (force_hpet_resume_type) {
case ICH_FORCE_HPET_RESUME:
ich_force_hpet_resume();
return;
case OLD_ICH_FORCE_HPET_RESUME:
old_ich_force_hpet_resume();
return;
case VT8237_FORCE_HPET_RESUME:
vt8237_force_hpet_resume();
return;
case NVIDIA_FORCE_HPET_RESUME:
nvidia_force_hpet_resume();
return;
case ATI_FORCE_HPET_RESUME:
ati_force_hpet_resume();
return;
default:
break;
}
}
/*
* According to the datasheet e6xx systems have the HPET hardwired to
* 0xfed00000
*/
static void e6xx_force_enable_hpet(struct pci_dev *dev)
{
if (hpet_address || force_hpet_address)
return;
force_hpet_address = 0xFED00000;
force_hpet_resume_type = NONE_FORCE_HPET_RESUME;
dev_printk(KERN_DEBUG, &dev->dev, "Force enabled HPET at "
"0x%lx\n", force_hpet_address);
return;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_E6XX_CU,
e6xx_force_enable_hpet);
/*
* HPET MSI on some boards (ATI SB700/SB800) has side effect on
* floppy DMA. Disable HPET MSI on such platforms.
* See erratum #27 (Misinterpreted MSI Requests May Result in
* Corrupted LPC DMA Data) in AMD Publication #46837,
* "SB700 Family Product Errata", Rev. 1.0, March 2010.
*/
static void force_disable_hpet_msi(struct pci_dev *unused)
{
hpet_msi_disable = 1;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS,
force_disable_hpet_msi);
#endif
#if defined(CONFIG_PCI) && defined(CONFIG_NUMA)
/* Set correct numa_node information for AMD NB functions */
static void quirk_amd_nb_node(struct pci_dev *dev)
{
struct pci_dev *nb_ht;
unsigned int devfn;
u32 node;
u32 val;
devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0);
nb_ht = pci_get_slot(dev->bus, devfn);
if (!nb_ht)
return;
pci_read_config_dword(nb_ht, 0x60, &val);
node = pcibus_to_node(dev->bus) | (val & 7);
/*
* Some hardware may return an invalid node ID,
* so check it first:
*/
if (node_online(node))
set_dev_node(&dev->dev, node);
pci_dev_put(nb_ht);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_ADDRMAP,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MEMCTL,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_HT,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MAP,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_DRAM,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_LINK,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F0,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F1,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F2,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4,
quirk_amd_nb_node);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F5,
quirk_amd_nb_node);
#endif
#ifdef CONFIG_PCI
/*
* Processor does not ensure DRAM scrub read/write sequence
* is atomic wrt accesses to CC6 save state area. Therefore
* if a concurrent scrub read/write access is to same address
* the entry may appear as if it is not written. This quirk
* applies to Fam16h models 00h-0Fh
*
* See "Revision Guide" for AMD F16h models 00h-0fh,
* document 51810 rev. 3.04, Nov 2013
*/
static void amd_disable_seq_and_redirect_scrub(struct pci_dev *dev)
{
u32 val;
/*
* Suggested workaround:
* set D18F3x58[4:0] = 00h and set D18F3x5C[0] = 0b
*/
pci_read_config_dword(dev, 0x58, &val);
if (val & 0x1F) {
val &= ~(0x1F);
pci_write_config_dword(dev, 0x58, val);
}
pci_read_config_dword(dev, 0x5C, &val);
if (val & BIT(0)) {
val &= ~BIT(0);
pci_write_config_dword(dev, 0x5c, val);
}
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_16H_NB_F3,
amd_disable_seq_and_redirect_scrub);
#endif
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